@charset "utf-8";

/* ==========================================
   1. RESET & BASE
   ========================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: #000;
    color: #fff;
    font-family: "Helvetica Neue", Arial, "Hiragino Sans", sans-serif;
    overflow-x: hidden;
    line-height: 1.6;
}

a {
    transition: 0.3s;
    text-decoration: none;
}

/* ==========================================
   2. NAVIGATION (HEADER)
   ========================================== */
header {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    z-index: 10000;
    border-bottom: 1px solid #e2e8f0;
}

nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 15px 24px;
}

.logo {
    font-size: 20px;
    font-weight: 900;
    letter-spacing: 0.1em;
    color: #0f172a;
}

/* Menu items */
nav ul {
    display: flex;
    gap: 30px;
    list-style: none;
}

nav ul li a {
    color: #0f172a;
    font-size: 14px;
    font-weight: 700;
}

nav ul li a:hover {
    color: #f59e0b; /* Naish Yellow */
}

/* Hamburger toggle */
.mobile-toggle {
    display: none;
    cursor: pointer;
    flex-direction: column;
    gap: 5px;
    padding: 10px;
}

.mobile-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: #000;
}

/* ==========================================
   3. HERO SECTION
   ========================================== */
.hero-container {
    position: relative;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
}

.hero-images {
    display: flex;
    width: 100%;
    height: 100%;
}

.hero-item {
    flex: 1;
    height: 100%;
    overflow: hidden;
}

.hero-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: grayscale(100%);
    transition: 0.8s ease;
}

.hero-item:hover img {
    filter: grayscale(0%);
    transform: scale(1.05);
}

/* Overlay Text & Button */
.hero-text-overlay {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    z-index: 50;
    text-align: center;
    width: 100%;
    pointer-events: none; /* 下の画像ホバーを邪魔しない */
}

.hero-main-title {
    font-size: clamp(40px, 8vw, 80px); /* 画面幅に応じて自動縮小 */
    color: #fff;
    font-weight: 900;
    letter-spacing: 0.2em;
    margin-bottom: 30px;
    text-shadow: 0 5px 20px rgba(0,0,0,0.6);
}

.hero-btn {
    display: inline-block;
    padding: 15px 40px;
    border: 2px solid #fff;
    color: #fff;
    font-weight: 700;
    background-color: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(5px);
    pointer-events: auto; /* ボタンだけはクリック可能に */
}

.hero-btn:hover {
    background-color: #fff;
    color: #000;
    transform: translateY(-3px);
}

/* ==========================================
   4. INFORMATION & COMPANY
   ========================================== */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 100px 24px;
}

.section-title {
    font-size: 24px;
    font-weight: 900;
    letter-spacing: 0.3em;
    margin-bottom: 50px;
    display: inline-block;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px; left: 0;
    width: 40px; height: 3px;
    background: #f59e0b;
}

/* Info List */
.info-section { background: #000; }

.info-list { list-style: none; }

.info-list li {
    border-bottom: 1px solid #333;
    padding: 24px 0;
    display: flex;
    align-items: center;
    gap: 20px;
}

.info-list li:hover { background: rgba(255,255,255,0.03); }

.date { color: #888; width: 120px; font-weight: bold; }

.category {
    font-size: 10px;
    border: 1px solid #f59e0b;
    color: #f59e0b;
    padding: 2px 8px;
}

.info-text { color: #fff; flex: 1; }

/* Company */
.company-section { background: #0a0a0a; }

.company-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 60px;
}

.company-info dl dt { color: #888; font-size: 12px; margin-top: 24px; }

.company-info dl dd {
    font-size: 18px;
    padding-left: 15px;
    border-left: 2px solid #333;
    margin-top: 5px;
}

/* Footer & SNS */
.social-links-area { display: flex; gap: 15px; margin-top: 20px; }

.social-switch {
    border: 1px solid #fff;
    color: #fff;
    padding: 10px 20px;
    font-size: 12px;
}

.social-switch:hover { background: #fff; color: #000; }

footer {
    padding: 60px;
    text-align: center;
    font-size: 11px;
    color: #555;
    background: #000;
}

/* ==========================================
   5. MOBILE RESPONSIVE
   ========================================== */
@media (max-width: 768px) {
    /* Nav */
    .mobile-toggle { display: flex; }
    
    nav ul {
        position: fixed;
        top: 0; right: -100%;
        width: 80%; height: 100vh;
        background: #fff;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: 0.4s;
    }
    
    nav ul.active { right: 0; }

    /* Layout */
    .hero-images { flex-direction: column; }
    .hero-item { width: 100%; height: 25%; }
    
    .company-grid { grid-template-columns: 1fr; }
    
    .info-list li {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }
}